Abstract: The majority of the natural soft soils have sensitivity. The undisturbed soft soil samples from Tianjin area are consolidation tested to a very high consolidation pressure in order to study the impact of the soil structural fabrics on the compressibility as well as the shape of the compression curves. The test results indicate that, under the same consolidation pressure, the deformation modulus in the vertical direction of the remolded soil is greater than that of the natural soil sample. The preconsolidation pressure of the natural soil is greater than that of the remolded soil; the compression modulus of the natural soil is greater than that of the remolded soil; the coefficient of the compression of the natural soil is smaller than that of the remolded soil. There is a power relationship exists in the coefficient of the compression, compression modulus and preconsolidation pressure. The laboratory test indicates that the sensitivity of the soil studied is 5 and it can be classified as "Sensitive" class.

Key words: Sensitivities of Soft Soils, Compressive Curves, Mechanical Properties